A very good write up.
I have often been disappointed by reviews of the Volt and how the press describes how it works. This is the first article that actually took the time to research how the Volt really works (other than articles already on auto enthusiast websites).
In a nut shell It's an EV until the battery gets low then it's a hybrid.
When running on gas it's a series hybrid under low or moderate load conditions and a parallel hybrid when under high load conditions.
The car is designed to use electricity as much as possible. But when using gas it tries to make the best use of that energy. As a mechanical engineer I find this car a masterpiece of engineering.
